Menstrual pain relievers are a type of medication designed to relieve menstrual cramps and menstrual pain. Menstrual cramps and pain are also known as primary and secondary dysmenorrhea. Primary dysmenorrhea is known as "common menstrual cramps" which refers to mild to severe pain felt in the lower back, shortly before or at the onset of the period. They continue for up to three days usually. Primary dysmenorrhea is typically felt less as a woman ages, and may be reduced even further for periods after which the woman has had a child (WebMD).

Menstrual pain relievers are designed to relieve pain felt during menstrual pain or primary dysmenorrhea. Other symptoms of primary dysmenorrhea include abdominal aching and pain, pressure in the abdomen, pain in the hips, lower back and inner thighs, and can also include upset stomach, vomiting, and loose stools (Mayo Clinic).

Menstrual pain and cramps are caused by contractions in the uterus. The uterus contracts during the menstrual cycle and can do so strongly enough to close off nearby blood vessels. The resulting lack of oxygen supply can cause menstrual pain.

Menstrual pain relievers can be prescribed by a medical doctor for use in order to treat menstrual pain or primary dysmenorrhea. Menstrual pain relievers are an Over-the-Counter (OTC) medication and are considered eligible for reimbursement with a consumer-directed healthcare account, if prescribed by a medical professional.